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Osmium is a hard, brittle, blue-gray metal, and the densest stable element—about twice as dense as lead. The density of osmium is slightly greater than that of iridium ; the two are so similar (22.587 versus 22.562 g/cm 3 at 20 °C) that each was at one time considered to be the densest element.
The mineral is colorless, milky-white, grey, pale-yellow, green, to pale-brown. The specific gravity is 4.3, which is high for a translucent mineral. [2] It fluoresces light blue under both long- and short-wave UV light, and is phosphorescent under short-wave UV light. [2] Witherite forms in low-temperature hydrothermal environments.
Zinc is bluish-white and lustrous, [9] though most common commercial grades of the metal have a dull finish. [10] Zinc is also referred to in nonscientific contexts as spelter. [11] Cadmium is soft, malleable, ductile, and with a bluish-white color. Mercury is a liquid, heavy, silvery-white metal.
The white metals are a series of often decorative bright metal alloys used as a base for plated silverware, ornaments or novelties, as well as any of several lead-based or tin-based alloys used for things like bearings, jewellery, miniature figures, fusible plugs, some medals and metal type. [1]
With itself, lead can build metal–metal bonds of an order up to three. [91] With carbon, lead forms organolead compounds similar to, but generally less stable than, typical organic compounds [92] (due to the Pb–C bond being rather weak). [65] This makes the organometallic chemistry of lead far less wide-ranging than that of tin. [93]
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